As with all forms of construction used in boat
building, the impact resistance of the finished hull is not only
set by the type of material used but also by the size and shape
of the hull. I have no intention of using the help and advice
forum to begin a comparison debate. The figures for all mediums
from many tests are well documented from considerable research.
As an example..a 35ft typical hull built the Hartley method (averaging
3/4" thickness and 30lb steel content per cuft), will approximate
8,000 lb per sqin in 14 days moving to 11,000 in 28 and establishing
around 19,000 after 90 days. Only an acceptable thickness of
solid steel plate can match it. Under certain conditions, all
hulls can be damaged by impact regardless of what materials are
used. Regards
Colin Brookes...colb@xtra.co.nz |
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